e11

	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�11 2021)
to russian

SCIENTIFIC-TECHNICAL SECTION

DOI: 10.34641/SP.2021.1044.11.045
Bezborodov I. A. � Electric arc deposition of nitrogen-containing coatings with an assessment of their scoring resistance under sliding friction conditions

The article presents studies of the electric arc deposition method of nitrogen-containing coatings, as a result of which a multifactorial mathematical model is obtained, which establishes the relationship between the deposition mode parameters with fluxcored wire PP-10Kh17N8S5G2T in a protective atmosphere of 50 % N2 + 50 % CO2 and nitrogen assimilation by the deposited metal. Along with this, the results of studies of the scoring resistance of nitrogen-containing coatings obtained at the electric arc deposition in nitrogen-containing protective media are presented. A unique feature of the nitrogen alloying method consist in that at increase in hardness of only 10 �R� the scoring resistance of the deposited coating increases by 1.71 times. The technological possibilities of creating deposited nitrogen-containing surfaces are attractive for the restoration of the crankshafts necks of internal combustion engines and large-sized structures, due to the impossibility of using common furnace heating for their nitration.
Key words: strengthening nitrogen-containing coatings, assimilation of nitrogen by deposited metal, protective nitrogen-containing environment, composition of the protective environment, composition of the surfacing wire, carbonitride inclusions, the hardness of the deposited metal, scoring resistance of deposited coating

DOI: 10.34641/SP.2021.1044.11.046
Feofanov A. N., Ovchinnikov V. V., Gubin A. M. � Mechanical properties of compounds of aluminum matrix dispersed-hardened composite material with alloy 1151T, made by friction welding with mixing the battery house made from polyethylene

The use of friction welding with mixing makes it possible to obtain defect-free compounds of aluminum alloy 1151T with a dispersed-hardened composite material based on a matrix of alloy D16T reinforced with Al2O3 particles with a volume fraction of 20 %. It is established that the weld is formed by alternating strips with a width of 0.25�0.50 microns, between which there is a clear boundary with a limited diffusion of elements between the strips. The results of tests of welded joints of the studied materials for low-cycle fatigue showed that the endurance limit on the basis of 107 cycles was 71 MPa. The fatigue crack arises from the ridges on the seam surface and then spreads through the zone of thermomechanical influence and the zone of thermal influence. At the roughness of the seam surface Rz > 70 microns, a multi � stage nature of destruction is observed, and at the value of the surface roughness Rz < 50 microns, a single-stage one is observed. In the second case, a more viscous fracture is observed.
Key words: aluminum alloy 1151T, dispersed-hardened composite material, friction welding with mixing, time resistance, grain size, microhardness, low-cycle fatigue, multistage nature of destruction

DOI: 10.34641/SP.2021.1044.11.047
Ponomarev K. E., Strelnikov I. V., Antonov A. A., Utkin I. Yu. � Application of various methods of vibration treatment for angle welded joints made of steel 09G2S

Residual stresses and deformations formed as a result of arc welding can negatively affect the service characteristics of welded structures: the accuracy of geometric dimensions during machining and subsequent operation decreases, which complicates assembly, requires an increase in allowances for machining and increases the tolerance for product weight, as well as fatigue strength decreases, corrosion resistance decreases.
One of the progressive methods for regulating and eliminating residual stresses is vibration treatment, which consists in introducing periodic mechanical action into the welded structure. There are two main methods of vibration treatment, which differ in the time of its implementation: during welding and after its completion. The article considers the application of various methods of vibration treatment for angular welded joints made of 09G2S steel with an assessment based on the criteria of residual stresses, residual displacements, as well as technological characteristics and mechanical properties.
Key words: arc welding, T-joint, lap joint, vibration treatment accompanying welding, post-welding vibration treatment, residual stresses, residual deformations, laser interferometry, 3D laser scanning, amplitude-frequency response

DOI: 10.34641/SP.2021.1044.11.048
Khodakov D. V., Khodakov V. D., Lukicheva C. V., Praliev D. A., Abrosin A. A., Stanitsky V. D., Bazanov M. A., Rymkevich A. I. � Heat treatment in the manufacture and repair of heterogeneous welded joints made of austenitic and perlite (carbon and silica) steel classes of NPP equipment with VVER-440 reactors

Heat treatment of welded structures is one of the most important technological operations performed during the manufacture, installation and repair of equipment and pipelines of nuclear power plants. Currently, it is not yet possible to unambiguously assess the degree of positive or negative impact from the heat treatment operation for heterogeneous welded joints, since the basic and welding materials that make up them have significant differences in mechanical, thermal and corrosion-resistant properties.
It is known that when heated to heat treatment temperatures, different parts of dissimilar welded joints can react differently, leading to a decrease in the operational properties of welded joints.
Key words: heterogeneous welded joints, fusion zone, heat treatment, metallographic studies

DOI: 10.34641/SP.2021.1044.11.049
Bulkov A. B., Peshkov V. V., Korchagin I. B., Bokarev D. I., Selivanov G. V. � Kinetics of restoration of plastic properties of oxidized surfaces of titanium and its alloys by annealing

The article describes the process of cleaning the surfaces of titanium VT1 and alloys OT4, VT6 from the embrittled part of the oxide layer under conditions of non-oxidative annealing.
Dependences were obtained experimentally that allow us to estimate the time and temperature of non-oxidative annealing, which ensure the cleaning of titanium surfaces from embrittled layers of various thicknesses. The dependence of the annealing temperatures on the chemical composition of the welded workpieces is established. The physicochemical state of the contact surfaces of workpieces for diffusion welding is proposed to be estimated by the depth of gas-saturated layers
Key words: diffusion welding, titanium, oxide embrittled layers

PRODUCTION SECTION

DOI: 10.34641/SP.2021.1044.11.050
Barabanova O. A., Nabatchikov S. V. � Causes of residual stresses in a diffusion welded joint monocrystalline silicon-metal

For the process of diffusion welding, the prehistory of the parts to be welded is of great importance, all internal stresses accumulated in the process of all types of processing of these parts, and their evolution during thermal deformation processing in the process of diffusion welding. This knowledge becomes especially important in the development of technology for the manufacture of laminated composite materials (SCM) based on monocrystalline silicon through metal interlayers for gradient heat measurement. Silicon monocrystals obtained by the Czochralski method provide almost 80�90 % of monocrystalline silicon wafers, which is reflected in the number of studies carried out.
Key words: diffusion welding, residual stresses, monocrystalline silicon, metal, laminated composite material

DOI: 10.34641/SP.2021.1044.11.051
Petrov P. Yu. � Conceptual relationship of the terms "Technological process" and "Welding"

Improving the conceptual apparatus of welding production, including on the basis of comparing definitions of terms in the current standards, is an urgent task. The article provides an analysis of six definitions of the terms "technological process" and the term "welding". It is shown that there is no direct conceptual connection between these terms. Such a relationship is indicated in the description of welding in GOST R ISO 3834-1.
However, the interpretation of welding as a special process in the terminology of the quality management system is not correct and should be removed from the current standards.
From the standpoint of the content of the system, the term "technological process" can be defined as follows: "A group of technological methods for joining separate material objects into an integral, whole product (sample, organ) by means of a local change in their energy state at the place (s) of the joint, which can initiate melting and/or plastic deformation ". This article actually continues the scientific discussion about terminology in the field of welding, which was started by a number of publications in the journal "Welding Production" in 2017 and obviously should end with a revision of the welding standards system.
Key words: term, definition, standard, technological process, welding, technological method, technological operation, type of welding

ECONOMY AND ORGANIZATION OF PRODUCTION

DOI: 1034641/SP.2021.1044.11.052
Muravyev I. I., Kornev S. Yu., Kuliyev I. I., Velezhinsky A. V. � Increasing the fatigue strength of welded T-bar joints

��: 127015, ��, �/� 65.
��.: +7 (495) 640-7903
e-mail: ic@ic-tm.ru

� 2008-2024, ��
�� - www.itsite.ru